Design and implement a barebones bytecode generator

[Jeanine Adkisson]

Using current notes and a bit of help from @sigfig, generate high-level bytecode from the skeleton AST.

Current (very wip) versions of notes:

• http://hastebin.com/raw/ucixaralol
• https://gist.github.com/Sigfig/6e74eceaab1285e2af89